Finding the Fourth Proportional to 708,766.72, 978,090.96 and 386,476

Step by Step Solution

1. Step 1: Write the proportion equation
   708,766.72 : 978,090.96 = 386,476 : x
2. Step 2: Convert to fraction form
   708,766.72/978,090.96 = 386,476/x
3. Step 3: Cross multiply
   708,766.72x = 978,090.96 × 386,476
4. Step 4: Simplify right side
   708,766.72x = 378,008,681,856.96
5. Step 5: Solve for x
   x = 378,008,681,856.96/708,766.72
6. Step 6: Final answer
   x = 533,333.00